I have three perspectives on this.

#1, when a person is sexually abused, they aren't always good at protecting themselves. Children, for instance, grow up with poor boundaries and sometimes become promiscuous and seek out unhealthy things. I was talking about this last night because of #metoo and compared it to being a vampire victim, like you are sick and it isn't your fault but you do things that make you vulnerable. This is based on personal experience.

#2, I have heard a theory that I also relate to that we sometimes try to recreate bad things like this to try to "fix it" somehow.

#3, Some women do have rape fantasies.... What you imagine in your head and what you can create with a trusted partner are different. I've had mixed up feelings about sex, and I have most definitely been abused.

I don't know what you as the partner are supposed to do about any of this or how to discuss it with her... It's very complicated and while I can share input like that on she might feel, I am not wise in the matters of handling delicate matters well.